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is a significant concern for physicians. Central; `- A) S% d( a& c1 d
precocious puberty (CPP), which is mediated
# o5 i0 n0 W' ]5 Z8 Kthrough the hypothalamic pituitary gonadal axis, has8 @$ ]" m8 {- o/ u5 M5 c
a higher incidence of organic central nervous system7 F6 g% R; ~. D9 r) r, O+ [- N
lesions in boys.1,2 Virilization in boys, as manifested$ V0 v8 B s$ g) O- [+ u! \
by enlargement of the penis, development of pubic
7 p1 M8 w1 p' ahair, and facial acne without enlargement of testi-+ ?: Z6 W0 U# l/ I, T. I
cles, suggests peripheral or pseudopuberty.1-3 We$ g' i" G9 P/ t, Q
report a 16-month-old boy who presented with the" y3 B! u/ X$ S
enlargement of the phallus and pubic hair develop-! h9 u& v# u5 d6 }
ment without testicular enlargement, which was due
" M3 k- P+ f4 Y' m3 e0 Eto the unintentional exposure to androgen gel used by* ?5 H5 x/ h! l- M$ K$ n
the father. The family initially concealed this infor-5 _9 y# q- M+ j$ u% |
mation, resulting in an extensive work-up for this" @$ v7 h) H! z: x, W* W& V
child. Given the widespread and easy availability of
- {7 z, J* k. H4 _1 Dtestosterone gel and cream, we believe this is proba-' v- x5 z" {( f G( o
bly more common than the rare case report in the l9 Z$ F) ]3 r& E0 e; P
literature.4* C7 V& i# A$ G. X7 [/ U( F
Patient Report& k7 J0 M5 A- z: S F1 K6 _$ r
A 16-month-old white child was referred to the
, y4 R7 r9 ^3 [" N% c" `, Eendocrine clinic by his pediatrician with the concern! b6 E8 I. ~5 v1 c# h& p, `/ O' v4 ^
of early sexual development. His mother noticed
8 P& ?! A% Q' O2 @* l6 Jlight colored pubic hair development when he was
6 R5 k" f" d* z) c4 k4 E' VFrom the 1Division of Pediatric Endocrinology, 2University of
/ D3 ] M8 S! C' q( ~South Alabama Medical Center, Mobile, Alabama.
3 s& {2 r7 G' i z2 KAddress correspondence to: Samar K. Bhowmick, MD, FACE,
7 q- X, P! z/ j7 dProfessor of Pediatrics, University of South Alabama, College of
$ d" w: c5 \, `2 cMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;( K" q% D- C6 T. q
e-mail: [email protected].: Y7 @7 j: H1 Y9 C* e( _) A
about 6 to 7 months old, which progressively became
4 e) H$ f; L2 Y1 A* |' O2 e! ?! W W! sdarker. She was also concerned about the enlarge-4 p/ ^: @9 m% R7 C+ [5 _
ment of his penis and frequent erections. The child+ Q! \9 I& n5 R+ Q0 [+ n
was the product of a full-term normal delivery, with: U4 g0 s* z4 l& @& o6 X! Q7 T
a birth weight of 7 lb 14 oz, and birth length of
/ h6 t0 } W' t/ e ~/ M20 inches. He was breast-fed throughout the first year
- b; X: Q* c, _of life and was still receiving breast milk along with7 o$ A. D. J' |
solid food. He had no hospitalizations or surgery,( z1 E+ C' F+ g9 o; f
and his psychosocial and psychomotor development
/ M1 q& X/ D- Y; x) w, N; `was age appropriate.
7 S; p8 a& x# A: _- UThe family history was remarkable for the father,
' k3 G0 d, h: A' D: Awho was diagnosed with hypothyroidism at age 16,
9 t! N7 S# Y5 j1 A8 f* S, D% ywhich was treated with thyroxine. The father’s
3 c7 m% [. ~5 xheight was 6 feet, and he went through a somewhat3 f6 `" o0 B& z4 b0 s1 G+ @
early puberty and had stopped growing by age 14.! @; d; Q& g2 M* R9 B
The father denied taking any other medication. The
1 n0 P. t) J; tchild’s mother was in good health. Her menarche
3 Z+ D" b$ K" Ewas at 11 years of age, and her height was at 5 feet
* E( c0 ?" _- n6 P8 r G$ ~2 r5 inches. There was no other family history of pre-/ E" w' Z, j, }) @
cocious sexual development in the first-degree rela-
' Z& S ?5 d8 q/ ptives. There were no siblings.+ w3 H- x- v0 A
Physical Examination
' L1 \' X) F6 d/ L% {- n0 qThe physical examination revealed a very active,! L3 U/ \: v# C) V0 l! i( l5 P7 A0 H! D* Z
playful, and healthy boy. The vital signs documented
0 M6 l+ b; @9 C% _* c/ Wa blood pressure of 85/50 mm Hg, his length was* j3 p! K A) W; B; X& @
90 cm (>97th percentile), and his weight was 14.4 kg8 S8 v8 O8 d/ X3 k, Q; T( j7 I
(also >97th percentile). The observed yearly growth, ~ y% p" l' \) P# y) |( n
velocity was 30 cm (12 inches). The examination of
+ R- Q% m/ z' a$ ]8 f) Nthe neck revealed no thyroid enlargement.
' [* t1 P( n! K0 M8 g+ a# VThe genitourinary examination was remarkable for0 y% K! D% F6 C: Q
enlargement of the penis, with a stretched length of5 A( S4 k& K% [# V1 Z% ]$ @
8 cm and a width of 2 cm. The glans penis was very well
% x6 m6 E! g; F6 w/ A1 e4 Ydeveloped. The pubic hair was Tanner II, mostly around
9 O: Z5 u$ R$ K0 s8 Z) Z- `' C) k% h540
- x* C2 I; J( d; N( x0 K/ hat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from0 J- y1 H, b3 Z* B
the base of the phallus and was dark and curled. The5 `& | `4 B" U* t, n) C( e3 p
testicular volume was prepubertal at 2 mL each.: h4 g2 T) f8 V {% ~7 R8 m
The skin was moist and smooth and somewhat: O& l S0 g' O" r4 I6 P
oily. No axillary hair was noted. There were no- h( a7 `! M* Y$ D0 @2 N6 x
abnormal skin pigmentations or café-au-lait spots.
! [6 M8 j! k- n& B- \3 pNeurologic evaluation showed deep tendon reflex 2+
# B( ~7 I, w$ S7 b6 `0 i! m1 Ybilateral and symmetrical. There was no suggestion
+ ~# X1 Z& E" Cof papilledema.
) K7 |* A, Q( v3 D& R) ]Laboratory Evaluation
6 t5 e; w' t/ f6 Z: E; [5 X& IThe bone age was consistent with 28 months by$ s$ V) s- [; `0 M% Y8 U& i
using the standard of Greulich and Pyle at a chrono-
& b. [3 n+ }4 s9 Flogic age of 16 months (advanced).5 Chromosomal
# v% Z6 J: z4 [9 d' V. [ akaryotype was 46XY. The thyroid function test
0 A6 k) B( H' j! i4 E) Nshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
: g9 E$ y. s2 Hlating hormone level was 1.3 µIU/mL (both normal).
# ] W/ H7 L G! `1 U/ dThe concentrations of serum electrolytes, blood
+ Z* Q! k9 V+ }$ _" \urea nitrogen, creatinine, and calcium all were
" w; Z, C! U; @0 r# kwithin normal range for his age. The concentration
: s& g( t- C$ v. T! `( h# `of serum 17-hydroxyprogesterone was 16 ng/dL) u+ w7 Z3 t; _9 F/ Z
(normal, 3 to 90 ng/dL), androstenedione was 20# k" W" {$ K# z& s' e
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
% {# e6 y' ^- V7 U+ R& _: }1 ^terone was 38 ng/dL (normal, 50 to 760 ng/dL),- u0 n1 g$ z3 o$ N
desoxycorticosterone was 4.3 ng/dL (normal, 7 to0 V6 T) D u+ Q
49ng/dL), 11-desoxycortisol (specific compound S)
/ b( R# a5 a7 jwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
. W0 U& s& w1 X( V2 k. V4 r% [ @tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total: M. T) p6 c3 Z5 d3 J
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),1 [5 ?4 j% _7 z
and β-human chorionic gonadotropin was less than7 H; M! ]6 ~; l8 K L4 l7 |2 v
5 mIU/mL (normal <5 mIU/mL). Serum follicular# s: n/ I5 o L P5 ` @- t3 I
stimulating hormone and leuteinizing hormone' T8 D5 D: D$ A0 p @2 I6 }
concentrations were less than 0.05 mIU/mL4 o- C* O1 j t1 _! H
(prepubertal).& U# b( B8 W- ]" Q: Z" [# F) Y
The parents were notified about the laboratory6 x4 H8 ~6 d& h+ L, z7 h
results and were informed that all of the tests were
, N. o s/ o. }! Anormal except the testosterone level was high. The" G9 `3 r+ O, I8 K1 L2 X
follow-up visit was arranged within a few weeks to+ G, T' l' u5 Y$ i
obtain testicular and abdominal sonograms; how-0 @& y" V7 y8 ^/ `, {& W
ever, the family did not return for 4 months.3 w$ B2 g8 f& K/ n& t
Physical examination at this time revealed that the9 F3 \, H0 B+ @9 f1 Z
child had grown 2.5 cm in 4 months and had gained
9 H. }( e' c* M2 kg of weight. Physical examination remained3 _2 o: X1 c T6 N1 ]2 r Q
unchanged. Surprisingly, the pubic hair almost com-
1 v) `$ H8 X3 e7 ]* O- X5 j spletely disappeared except for a few vellous hairs at6 K: c$ [" k- W4 ` z' o3 ~
the base of the phallus. Testicular volume was still 2
- V" {9 u3 C# L) s: nmL, and the size of the penis remained unchanged.$ x. b( J1 }4 G
The mother also said that the boy was no longer hav-
* e4 u; v" W8 D2 J; X: a' jing frequent erections.( {. W+ X/ Z3 p' M$ s
Both parents were again questioned about use of
- o, K g0 D1 I. F5 i& aany ointment/creams that they may have applied to
( S, p/ j. j B5 g2 Uthe child’s skin. This time the father admitted the) Z$ B$ ~5 k9 x) J) Y3 c, @, w, C
Topical Testosterone Exposure / Bhowmick et al 541
; M7 v1 c/ ~2 y) v- r# x& Xuse of testosterone gel twice daily that he was apply-5 L, }, \$ r& V/ e9 O- |$ h
ing over his own shoulders, chest, and back area for
/ j* D9 h' r: T0 J: f: ]" {) Ea year. The father also revealed he was embarrassed0 F+ `3 v- P6 H2 X* D
to disclose that he was using a testosterone gel pre-" b; d, d0 A) W7 Q. R
scribed by his family physician for decreased libido/ l p( @1 h, x9 O: B7 k( c) {( A
secondary to depression., r# |) z3 a% ~8 c
The child slept in the same bed with parents.! m1 y! Q1 [( f
The father would hug the baby and hold him on his
$ A* v% e. x' m) ]chest for a considerable period of time, causing sig-3 A7 W" D% u: _6 Q% o6 N- B& D `
nificant bare skin contact between baby and father.% H! n- {1 U/ n. \5 t; r
The father also admitted that after the phone call, }8 ^7 ], ], A$ \( x) s
when he learned the testosterone level in the baby
3 h3 v( i4 E7 A! B8 ewas high, he then read the product information
4 X* q( v: h! i' L/ U2 J% Apacket and concluded that it was most likely the rea-
' |5 o5 H8 d8 {# S4 |; Y: B' P& q) nson for the child’s virilization. At that time, they2 }# H4 G7 S1 C- U# F0 g) i
decided to put the baby in a separate bed, and the
" Q9 _) E8 O4 {; _1 ?0 |father was not hugging him with bare skin and had8 p+ f9 P9 @: X
been using protective clothing. A repeat testosterone u$ N2 H( A% b6 e: V/ p
test was ordered, but the family did not go to the
- l( x7 g8 o9 j$ M8 ?5 Plaboratory to obtain the test.
! |: t+ q0 }# G @Discussion
9 |6 |' N, T9 L) i* rPrecocious puberty in boys is defined as secondary" N& m# Z$ R1 I+ H3 B. Y
sexual development before 9 years of age.1,4) }, ?0 j0 j3 R3 l3 m( Y
Precocious puberty is termed as central (true) when
1 u+ V3 Y5 [8 k: o; m# P: t, Ait is caused by the premature activation of hypo-% q3 h; j% x1 H, m
thalamic pituitary gonadal axis. CPP is more com-
$ N- G+ B+ V! Q' f3 B: emon in girls than in boys.1,3 Most boys with CPP* [1 d, h) _& h# {/ S
may have a central nervous system lesion that is* W* E$ i! c- g
responsible for the early activation of the hypothal-
7 q' G4 ~7 B, `* A, Ramic pituitary gonadal axis.1-3 Thus, greater empha-
1 G# L% \ k2 {' Rsis has been given to neuroradiologic imaging in, i5 q) i$ r* J; D& U4 A$ k. `
boys with precocious puberty. In addition to viril-+ M5 K' C/ ^2 b- e& x' F! Q
ization, the clinical hallmark of CPP is the symmet-
# v4 _; Y/ z* ~rical testicular growth secondary to stimulation by( u+ N0 Q( p1 S' s R2 T% @. ]
gonadotropins.1,38 }# J& R& [- s7 ~; C+ H
Gonadotropin-independent peripheral preco-
4 n4 M. }! m% _/ s) \ Dcious puberty in boys also results from inappropriate5 _4 l" o3 X' ]+ L8 K& o6 h
androgenic stimulation from either endogenous or% F, @7 r+ | A/ @
exogenous sources, nonpituitary gonadotropin stim-
1 a7 o; H0 e% Z* c z% c9 h( hulation, and rare activating mutations.3 Virilizing
6 l' A, d( S- d8 wcongenital adrenal hyperplasia producing excessive n& m$ J7 S1 g- m6 ]
adrenal androgens is a common cause of precocious& g. p3 O/ {0 ^8 T, @" g
puberty in boys.3,4 @; W) X! T6 M F6 X9 V7 I" k
The most common form of congenital adrenal
2 ~ a! \/ p. z$ Ghyperplasia is the 21-hydroxylase enzyme deficiency., [; q$ @; [2 R$ s# _, }6 k: r
The 11-β hydroxylase deficiency may also result in
0 _* a. G2 ]7 S% hexcessive adrenal androgen production, and rarely,
4 h2 s& x4 n) D1 d+ I! Ban adrenal tumor may also cause adrenal androgen
% l& K! N6 d& x1 pexcess.1,3
: v" ?" T2 K$ I' T' hat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
2 w& e# \: x1 k% ^2 ?542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
3 f5 k+ }4 x( A' PA unique entity of male-limited gonadotropin-, B- H. W7 `( ]# `' j
independent precocious puberty, which is also known
( ^, L$ B4 i! i# has testotoxicosis, may cause precocious puberty at a
& H8 T6 o" x g r# \very young age. The physical findings in these boys. G6 O/ n" f# w3 N" X
with this disorder are full pubertal development,
" z* b, T) e% r; _! m% b% cincluding bilateral testicular growth, similar to boys
* E' y9 \6 F ]: _" z$ w4 w% rwith CPP. The gonadotropin levels in this disorder! W+ f" X5 j% s- c
are suppressed to prepubertal levels and do not show
) e& v+ J- y2 c5 D/ E) npubertal response of gonadotropin after gonadotropin-
8 ~: `- _6 c+ freleasing hormone stimulation. This is a sex-linked# K) H+ Q6 ]( l( v, t
autosomal dominant disorder that affects only
% X+ P6 x+ `6 U! Q4 g, c7 S3 Rmales; therefore, other male members of the family
% u1 D, `8 @- l8 j4 Pmay have similar precocious puberty.3
: d) [# y1 ^/ {9 a2 ^7 t" [/ WIn our patient, physical examination was incon-8 y) ?6 E; u9 s3 T0 t' N
sistent with true precocious puberty since his testi-
: `7 O4 K5 n$ F0 pcles were prepubertal in size. However, testotoxicosis
! |5 x6 d2 l6 s/ M8 @was in the differential diagnosis because his father
3 B! j! A" G& s( u3 E4 W' Tstarted puberty somewhat early, and occasionally,3 \ Y2 t' S" h! a" q
testicular enlargement is not that evident in the4 r# d2 u! i7 T* R3 f+ V; ~
beginning of this process.1 In the absence of a neg-
* Z. f" h j9 {) s& [ative initial history of androgen exposure, our
1 K8 A, N& n) y* b5 B; j) P6 `biggest concern was virilizing adrenal hyperplasia,
% {4 ], k3 X2 c7 Heither 21-hydroxylase deficiency or 11-β hydroxylase8 c, ~# I; \5 Q: @/ G. n% l
deficiency. Those diagnoses were excluded by find-3 l# I) s' p# s, G, _" a
ing the normal level of adrenal steroids.
' d7 K. J0 l0 s) l! XThe diagnosis of exogenous androgens was strongly6 U& I6 C' a; _5 |
suspected in a follow-up visit after 4 months because5 l m6 _+ m& w4 B" j: J }
the physical examination revealed the complete disap-! Z# z- C- @& ^1 B) w
pearance of pubic hair, normal growth velocity, and0 h0 A; I1 R( ?
decreased erections. The father admitted using a testos-
' {0 m7 ~3 W1 F) c: Qterone gel, which he concealed at first visit. He was
! Z' S% B6 J2 ]1 R4 h h" a3 _) ~using it rather frequently, twice a day. The Physicians’3 z1 z' ~3 ~1 @# ?6 w
Desk Reference, or package insert of this product, gel or2 H1 a. m1 z5 b1 R( ^
cream, cautions about dermal testosterone transfer to
2 P) s! a7 T" f$ R3 M; w/ ~unprotected females through direct skin exposure.! U+ H, w a! w. ~
Serum testosterone level was found to be 2 times the
' Q) J2 ]1 e5 X7 K" A5 z2 tbaseline value in those females who were exposed to/ J; A p, M' X% [
even 15 minutes of direct skin contact with their male# m1 a- h4 c1 B9 S! E" @+ v" ^
partners.6 However, when a shirt covered the applica-; o H$ N6 t, D4 Y4 k4 |, _7 Z
tion site, this testosterone transfer was prevented.9 y0 ?, D4 l( P! {
Our patient’s testosterone level was 60 ng/mL,
3 ?) C) p, i2 k# ]8 S y/ D/ uwhich was clearly high. Some studies suggest that
- y( g1 t' b* v2 gdermal conversion of testosterone to dihydrotestos-* g, N) b C+ ?3 q
terone, which is a more potent metabolite, is more
& ^$ S9 H' C' }9 n6 Vactive in young children exposed to testosterone
$ F, `3 z, z/ d# }/ H. `exogenously7; however, we did not measure a dihy-
1 F8 ], t0 H6 y0 v& sdrotestosterone level in our patient. In addition to6 }$ j; v; a; d) P
virilization, exposure to exogenous testosterone in3 @* c# v' ?' R3 Q) K' k
children results in an increase in growth velocity and" X0 a9 m7 K/ d9 y
advanced bone age, as seen in our patient.2 v. K. J3 ]2 p" ^. a
The long-term effect of androgen exposure during
4 y4 q1 m. ~! X: F- j& S: fearly childhood on pubertal development and final9 _* r" D+ b2 I6 d4 G
adult height are not fully known and always remain0 ~/ r% y6 U1 R# C
a concern. Children treated with short-term testos-
% O# c$ Y/ [ M: w7 U; n6 ^terone injection or topical androgen may exhibit some
# {9 Q& J% @. racceleration of the skeletal maturation; however, after
& o0 J% C; e- Y1 L7 I, U6 x7 kcessation of treatment, the rate of bone maturation2 G2 T# B1 [- ^! V* q% H6 m
decelerates and gradually returns to normal.8,96 S5 R3 b; X5 h7 l; V$ L$ ]4 l
There are conflicting reports and controversy
; } y4 G) |3 N9 [over the effect of early androgen exposure on adult' b& T& K0 K) i6 G
penile length.10,11 Some reports suggest subnormal
' g8 o7 o7 l0 i0 d, Badult penile length, apparently because of downreg-
. [: W& u1 K) [5 Mulation of androgen receptor number.10,12 However,
2 |' ~3 ^; P% u- b/ d3 d Z a4 D# ?Sutherland et al13 did not find a correlation between3 r2 ^0 k t- ]
childhood testosterone exposure and reduced adult
. O- f: z7 \4 s4 d5 Ypenile length in clinical studies.
) E; t- P" t- T% @. u. mNonetheless, we do not believe our patient is
# ~, }7 i( @, p0 [going to experience any of the untoward effects from4 q: K: I. ?8 v$ g+ J
testosterone exposure as mentioned earlier because) P) M4 N/ i @$ ~8 H4 E$ }- D
the exposure was not for a prolonged period of time.
$ _6 U% P3 _0 }9 cAlthough the bone age was advanced at the time of+ e1 m4 F% _7 R" \1 T
diagnosis, the child had a normal growth velocity at
2 e+ w) e* M( O( vthe follow-up visit. It is hoped that his final adult+ v# t5 r) k$ {2 n0 M6 D6 T
height will not be affected.
3 g/ E# v5 d9 b& s* _# R, dAlthough rarely reported, the widespread avail-& T( ?. ?" D6 Y
ability of androgen products in our society may
( D/ V9 _- r( M" n; x& z3 Y* B" @indeed cause more virilization in male or female
. z3 a8 G2 a; ^. C6 `+ ^children than one would realize. Exposure to andro-
7 x1 V2 @# E, m/ x6 L) Qgen products must be considered and specific ques-" v2 w( D- ]4 h& G% X
tioning about the use of a testosterone product or
. a1 k7 {9 v& A: \gel should be asked of the family members during
# M& d6 V B3 D, i/ ?the evaluation of any children who present with vir-/ d' V }- L' r" Y
ilization or peripheral precocious puberty. The diag-7 O, k8 m# _; }
nosis can be established by just a few tests and by
* w% e+ F( m" L6 E+ Y" }+ G8 Cappropriate history. The inability to obtain such a
/ {9 A4 w n* X. O2 N- nhistory, or failure to ask the specific questions, may: ~% _! _0 F/ I, c
result in extensive, unnecessary, and expensive' a5 t% g" B# a9 Z5 w' }+ L# f5 u
investigation. The primary care physician should be
3 A* E5 K9 A" U% {aware of this fact, because most of these children& w% o! v4 y/ N3 H8 w/ |/ y/ k. D
may initially present in their practice. The Physicians’
* \" y7 _6 w+ c* O6 KDesk Reference and package insert should also put a
7 v0 O' b2 C3 @9 D+ bwarning about the virilizing effect on a male or
8 f7 J" K4 t$ x! _" J# K4 sfemale child who might come in contact with some-
! P j u1 y U y2 K6 l1 }one using any of these products.0 O# O% ]; `% S' y5 K6 W: b" m
References
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Topical Testosterone Exposure / Bhowmick et al 543+ B6 d& \4 `! r1 u, u& z9 j. c
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Economics Company, Inc; 2004:3239-3241.5 v1 K: {/ k: G5 D
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testosterone and gonadotropin. J Urol. 1978;119:
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